[Bug 147464] Re: Heavy network activity (eg: torrent/nfs file transfers) causes Hard System Locks and/or Network Freezes.

I Kovalev iakovalev at gmail.com
Mon Mar 8 14:33:15 UTC 2010


Have being using Transmission (1.75 to 1.91) for over a year in Ubuntu
9.04 to 9.10 on my Toshiba Satellite L40 laptop connected to the
Internet via built-in Atheros AR5007EG wireless card installed in mini-
PCI. While using Transmission I discovered that downloading from large
swarms at high speed resulted in regular system crash (kernel panic)
within 30 min to 1 hour. Recently it turned out the issue is system-
wide, i.e. any heavy network activity triggers system crash. My search
through Linux support community made me think that a bug in Linux kernel
which causes i/o stalls in some cases (seems has been fixed in kernel
2.6.32) could be responsible for it.

Recently however I have found a hardware problem in my laptop. The PCI
chip (not the CPU!) lacks proper cooling due to limitations in laptop
design, mechanical defect in its radiator and partial blocking of
ventilation slits by dust. After fixing mechanical problems my system
has become rock stable. Still I was able to trigger system crash by
heavy i/o activity - while downloading at ~2.5 MBits/s over wireless and
transferring lots of data (~10MByte/s) via IEEE1394 PCMCIA card
simultaneously and for a prolonged time providing that a temperature of
cooling air is above 24 deg C.

Problem solved.
Conclusion: before reporting a software problem, it should be wise to check all your hardware carefully...

-- 
Heavy network activity (eg: torrent/nfs file transfers) causes Hard System Locks and/or Network Freezes.
https://bugs.launchpad.net/bugs/147464
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